在北美，南美以及其他一些地方生产的精子和克隆动物胚胎，其在国际范围内的交易已经无法加以有效监管。
The international trade in semen and embryos from cloned animals created in north and south America and beyond was effectively impossible to police.
对于那些不熟悉可爱的草原田鼠的人来说，这是一种在北美中部草原上发现的小型啮齿动物。
For those unfamiliar with the delightful prairie vole, it is a small rodent found in the grasslands of central North America.
在缅因州，公路交通事故中最常杀死的动物种类是北美箭猪。
In Maine, the most commonly counted roadkill species is the North American porcupine.
例如，四趾的始祖鸟先于三趾的始祖鸟出现，但北美的化石证据表明，这两种动物之间有一个急促而不均衡的转换过程。
The four-toed Eohippus preceded the three-toed Miohippus, for example, but North American fossil evidence suggests a jerky, uneven transition between the two.
在北美洲生活着各种各样的巨兽，如猛犸象和乳齿象，都是长着巨大象牙的象状动物，还有骆驼和巨大的树懒，名单待续。
North America was populated by a wide variety of great beasts, like mammoth and mastodons, both elephant-like creatures with big tusks, and camels, giant sloths, the list goes on.
当1973年《濒危物种法案》签署时，人们期望它能保护一批引人注目的动物，如秃头鹰和黄石公园的北美灰熊。
When the Endangered Species Act was signed in 1973, it was expected to protect charismatic fauna such as the bald eagle and Yellowstone's grizzly bears.
当探险家们第一次踏上北美大陆时，天上和地上到处都是种类多得惊人的野生动物。
When the explorers first set foot upon the continent of North America, the skies and lands were alive with an astonishing variety of wildlife.
但是，至少我们知道——巴拉乌尔龙和亚洲和北美的动物关系如此密切，表明这些区域之间有物种交换。
But, the bottomline is - Balaur being so closely related to animals from Asia and North America suggests interchanges with that area.
这项研究确认了一些长期存在的民间传闻，即北美一种最常见的鸟类具有敏锐的能力。该研究同时也可能为这些野生动物如何对付一起生活的人类提供新的见解。
The study confirms some long-standing folklore about the acuity of one of North America's most familiar birds-and offers new insight into how some wild animals may cope with living alongside people.
北美洲也有它的世界冠军，其中包括狗科、驼科和马科动物——可以说他们是人类的好朋友。
But North America too has given the world its champions, including the dog, camel, and horse families-arguably man's best friends.
在北美这种动物现存一万只左右，他们全部都是由半个世纪以前的一个的物种进化而成，当时这个物种的数量只有三十只。
There are about 10,000 of these animals in North America. All of them are descended from an original population of just 30 that was introduced half a century ago.
在北美这种动物现存一万只左右，他们全部都是由半个世纪以前的一个的物种进化而成，当时这个物种的数量只有三十只。
There are about 10, 000 of these animals in North America. All of them are descended from an original population of just 30 that was introduced half a century ago.
瓦普斯克地区生长着大约7000支北美驯鹿，以及同样数量的驼鹿，还有无以计数的野兔、鱼类、大雁和其他动物。
Wapusk ishome to some 7, 000 caribou, an equal number of moose and untold numbersof rabbits, fish, geese and other creatures.
当冰盖从北美大陆上消退时，这些动物统治了整片大陆，其中甚至包括越野车大小的巨型树獭。
气候的突然变化使原本逐渐消融的冰川再次凝结，同时北美洲哺乳动物中有35个科完全灭绝。
The change in climate caused retreating glaciers to advance once again, and coincided with the extinction of 35 families of North American mammals.
在那时，鬃狼生活在北美洲，而且看来南美洲的犬科动物好像都起源于北方。
At that time, maned wolves lived in North America, and it seems that all of South America’s canids originated in the north.
结果这里上演了一场疯狂的免费大餐，演出了北美野生动物行为中最壮观的一幕。
The result is an avian feeding frenzy that ranks as on of the greatest wildlife spectacles of North America.
一些中等的哺乳动物，比如海狸以及北美野兔也是它们重要的第二食物来源。
Medium-sized mammals, such as beaver and snowshoe hares, can be an important secondary food source.
研究的数据来自对于分布在欧洲、北美、智利、马来西亚和南非马里恩岛的鸟类、哺乳动物、爬行动物、昆虫、蜘蛛、以及植物。
The data came from studies of birds, mammals, reptiles, insects, spiders and plants in Europe, North America, Chile, Malaysia, and South Africa's Marion Island.
北美两栖动物监测中心是美国最大的青蛙统计机构。
The North American Amphibian Monitoring Program is the country’s largest frog-counting system.
北美两栖动物监测中心是美国最大的青蛙统计机构。
The North American Amphibian Monitoring Program is the country's largest frog-counting system.
美洲野牛是北美陆地上体型最大的动物之一。
The American buffalo is one of the largest land animals in North America.
北美的黑脚印第安人也做画布。他们把故事画在动物皮上。
The Blackfoot Indians of North America also made story cloths. They painted their stories on animals skins.
这些都是只有7周龄，他们成大就是美洲虎，北美地区最大的猫科动物。
These are only 7 weeks old, when they grow to be Jaguars, the biggest cat in North America.
黑熊是北美最大型的哺乳动物之一，四肢着地肩高约有0.91米，身长约1.83米，体重大多在270公斤以上。
Black bears are one of the largest mammals in North America. They're about three feet high at the shoulder and six feet long and can easily weigh 300 pounds.
黑熊是北美最大型的哺乳动物之一，四肢着地肩高约有0.91米，身长约1.83米，体重大多在270公斤以上。
Black bears are one of the largest mammals in North America. They're about three feet high at the shoulder and six feet long and can easily weigh 300 pounds.
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